<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @myclick="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view @click="activeChange(i)" :class="['left-scroll-view-item',i == active? 'active' : '']" >{{item.cat_name}}</view>
        </block>


      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
        <!-- 二级分类标题 -->
          <view class="cate-lv2-title">
            {{item2.cat_name}}
          </view>
          <!-- 动态渲染三级分类的列表数据 -->
           <!-- 动态渲染三级分类的列表数据 -->
             <view class="cate-lv3-list">
               <!-- 三级分类 Item 项 -->
               <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                 <!-- 图片 -->
                 <image v-if="item3.cat_icon" :src="item3.cat_icon"></image>
                 <!-- 文本 -->
                 <text>{{item3.cat_name}}</text>
               </view>
             </view>
          
          
        </view>
     
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类列表
        cateLevel2:[],
          // 滚动条距离顶部的距离
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getWindowInfo()
      // console.log(sysInfo)
      this.wh = sysInfo.windowHeight - 50

      this.getCateList()
    },
    methods: {
      //获取分类列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMag()
        // console.log(res)
        this.cateList = res.message
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i){
        if(this.active == i) return
        this.active = i
        this.cateLevel2 = this.cateList[i].children
         // 让 scrollTop 的值在 0 与 1 之间切换
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item3){
       uni.navigateTo({
         url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
       })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;


        &.active {
          background-color: #ffffff;
          position: relative;

          &::before {
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  
    
  .cate-lv2 {
    background-color: white;
  }
  
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
  
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
  }
</style>
